jdk8-mips64-public/hotspot: src/share/vm/memory/allocation.cpp@c18cbe5936b8 (annotated)

src/share/vm/memory/allocation.cpp@c18cbe5936b8 (annotated)

src/share/vm/memory/allocation.cpp

Thu, 27 May 2010 19:08:38 -0700

author: trims
date: Thu, 27 May 2010 19:08:38 -0700
changeset 1907: c18cbe5936b8
parent 435: a61af66fc99e
child 2036: 126ea7725993
child 2040: 0e35fa8ebccd
permissions: -rw-r--r--

6941466: Oracle rebranding changes for Hotspot repositories
Summary: Change all the Sun copyrights to Oracle copyright
Reviewed-by: ohair

 /*
  * Copyright (c) 1997, 2005, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.
  *
  * This code is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  * version 2 for more details (a copy is included in the LICENSE file that
  * accompanied this code).
  *
  * You should have received a copy of the GNU General Public License version
  * 2 along with this work; if not, write to the Free Software Foundation,
  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  * or visit www.oracle.com if you need additional information or have any
  * questions.
  *
  */
 # include "incls/_precompiled.incl"
 # include "incls/_allocation.cpp.incl"
 void* CHeapObj::operator new(size_t size){
   return (void *) AllocateHeap(size, "CHeapObj-new");
 }
 void CHeapObj::operator delete(void* p){
  FreeHeap(p);
 }
 void* StackObj::operator new(size_t size)  { ShouldNotCallThis(); return 0; };
 void  StackObj::operator delete(void* p)   { ShouldNotCallThis(); };
 void* _ValueObj::operator new(size_t size)  { ShouldNotCallThis(); return 0; };
 void  _ValueObj::operator delete(void* p)   { ShouldNotCallThis(); };
 void* ResourceObj::operator new(size_t size, allocation_type type) {
   address res;
   switch (type) {
    case C_HEAP:
     res = (address)AllocateHeap(size, "C_Heap: ResourceOBJ");
     break;
    case RESOURCE_AREA:
     res = (address)operator new(size);
     break;
    default:
     ShouldNotReachHere();
   }
   // Set allocation type in the resource object for assertion checks.
   DEBUG_ONLY(((ResourceObj *)res)->_allocation = type;)
   return res;
 }
 void ResourceObj::operator delete(void* p) {
   assert(((ResourceObj *)p)->allocated_on_C_heap(),
          "delete only allowed for C_HEAP objects");
   FreeHeap(p);
 }
 void trace_heap_malloc(size_t size, const char* name, void* p) {
   // A lock is not needed here - tty uses a lock internally
   tty->print_cr("Heap malloc " INTPTR_FORMAT " %7d %s", p, size, name == NULL ? "" : name);
 }
 void trace_heap_free(void* p) {
   // A lock is not needed here - tty uses a lock internally
   tty->print_cr("Heap free   " INTPTR_FORMAT, p);
 }
 bool warn_new_operator = false; // see vm_main
 //--------------------------------------------------------------------------------------
 // ChunkPool implementation
 // MT-safe pool of chunks to reduce malloc/free thrashing
 // NB: not using Mutex because pools are used before Threads are initialized
 class ChunkPool {
   Chunk*       _first;        // first cached Chunk; its first word points to next chunk
   size_t       _num_chunks;   // number of unused chunks in pool
   size_t       _num_used;     // number of chunks currently checked out
   const size_t _size;         // size of each chunk (must be uniform)
   // Our three static pools
   static ChunkPool* _large_pool;
   static ChunkPool* _medium_pool;
   static ChunkPool* _small_pool;
   // return first element or null
   void* get_first() {
     Chunk* c = _first;
     if (_first) {
       _first = _first->next();
       _num_chunks--;
     }
     return c;
   }
  public:
   // All chunks in a ChunkPool has the same size
    ChunkPool(size_t size) : _size(size) { _first = NULL; _num_chunks = _num_used = 0; }
   // Allocate a new chunk from the pool (might expand the pool)
   void* allocate(size_t bytes) {
     assert(bytes == _size, "bad size");
     void* p = NULL;
     { ThreadCritical tc;
       _num_used++;
       p = get_first();
       if (p == NULL) p = os::malloc(bytes);
     }
     if (p == NULL)
       vm_exit_out_of_memory(bytes, "ChunkPool::allocate");
     return p;
   }
   // Return a chunk to the pool
   void free(Chunk* chunk) {
     assert(chunk->length() + Chunk::aligned_overhead_size() == _size, "bad size");
     ThreadCritical tc;
     _num_used--;
     // Add chunk to list
     chunk->set_next(_first);
     _first = chunk;
     _num_chunks++;
   }
   // Prune the pool
   void free_all_but(size_t n) {
     // if we have more than n chunks, free all of them
     ThreadCritical tc;
     if (_num_chunks > n) {
       // free chunks at end of queue, for better locality
       Chunk* cur = _first;
       for (size_t i = 0; i < (n - 1) && cur != NULL; i++) cur = cur->next();
       if (cur != NULL) {
         Chunk* next = cur->next();
         cur->set_next(NULL);
         cur = next;
         // Free all remaining chunks
         while(cur != NULL) {
           next = cur->next();
           os::free(cur);
           _num_chunks--;
           cur = next;
         }
       }
     }
   }
   // Accessors to preallocated pool's
   static ChunkPool* large_pool()  { assert(_large_pool  != NULL, "must be initialized"); return _large_pool;  }
   static ChunkPool* medium_pool() { assert(_medium_pool != NULL, "must be initialized"); return _medium_pool; }
   static ChunkPool* small_pool()  { assert(_small_pool  != NULL, "must be initialized"); return _small_pool;  }
   static void initialize() {
     _large_pool  = new ChunkPool(Chunk::size        + Chunk::aligned_overhead_size());
     _medium_pool = new ChunkPool(Chunk::medium_size + Chunk::aligned_overhead_size());
     _small_pool  = new ChunkPool(Chunk::init_size   + Chunk::aligned_overhead_size());
   }
 };
 ChunkPool* ChunkPool::_large_pool  = NULL;
 ChunkPool* ChunkPool::_medium_pool = NULL;
 ChunkPool* ChunkPool::_small_pool  = NULL;
 void chunkpool_init() {
   ChunkPool::initialize();
 }
 //--------------------------------------------------------------------------------------
 // ChunkPoolCleaner implementation
 class ChunkPoolCleaner : public PeriodicTask {
   enum { CleaningInterval = 5000,        // cleaning interval in ms
          BlocksToKeep     = 5            // # of extra blocks to keep
   };
  public:
    ChunkPoolCleaner() : PeriodicTask(CleaningInterval) {}
    void task() {
      ChunkPool::small_pool()->free_all_but(BlocksToKeep);
      ChunkPool::medium_pool()->free_all_but(BlocksToKeep);
      ChunkPool::large_pool()->free_all_but(BlocksToKeep);
    }
 };
 //--------------------------------------------------------------------------------------
 // Chunk implementation
 void* Chunk::operator new(size_t requested_size, size_t length) {
   // requested_size is equal to sizeof(Chunk) but in order for the arena
   // allocations to come out aligned as expected the size must be aligned
   // to expected arean alignment.
   // expect requested_size but if sizeof(Chunk) doesn't match isn't proper size we must align it.
   assert(ARENA_ALIGN(requested_size) == aligned_overhead_size(), "Bad alignment");
   size_t bytes = ARENA_ALIGN(requested_size) + length;
   switch (length) {
    case Chunk::size:        return ChunkPool::large_pool()->allocate(bytes);
    case Chunk::medium_size: return ChunkPool::medium_pool()->allocate(bytes);
    case Chunk::init_size:   return ChunkPool::small_pool()->allocate(bytes);
    default: {
      void *p =  os::malloc(bytes);
      if (p == NULL)
        vm_exit_out_of_memory(bytes, "Chunk::new");
      return p;
    }
   }
 }
 void Chunk::operator delete(void* p) {
   Chunk* c = (Chunk*)p;
   switch (c->length()) {
    case Chunk::size:        ChunkPool::large_pool()->free(c); break;
    case Chunk::medium_size: ChunkPool::medium_pool()->free(c); break;
    case Chunk::init_size:   ChunkPool::small_pool()->free(c); break;
    default:                 os::free(c);
   }
 }
 Chunk::Chunk(size_t length) : _len(length) {
   _next = NULL;         // Chain on the linked list
 }
 void Chunk::chop() {
   Chunk *k = this;
   while( k ) {
     Chunk *tmp = k->next();
     // clear out this chunk (to detect allocation bugs)
     if (ZapResourceArea) memset(k->bottom(), badResourceValue, k->length());
     delete k;                   // Free chunk (was malloc'd)
     k = tmp;
   }
 }
 void Chunk::next_chop() {
   _next->chop();
   _next = NULL;
 }
 void Chunk::start_chunk_pool_cleaner_task() {
 #ifdef ASSERT
   static bool task_created = false;
   assert(!task_created, "should not start chuck pool cleaner twice");
   task_created = true;
 #endif
   ChunkPoolCleaner* cleaner = new ChunkPoolCleaner();
   cleaner->enroll();
 }
 //------------------------------Arena------------------------------------------
 Arena::Arena(size_t init_size) {
   size_t round_size = (sizeof (char *)) - 1;
   init_size = (init_size+round_size) & ~round_size;
   _first = _chunk = new (init_size) Chunk(init_size);
   _hwm = _chunk->bottom();      // Save the cached hwm, max
   _max = _chunk->top();
   set_size_in_bytes(init_size);
 }
 Arena::Arena() {
   _first = _chunk = new (Chunk::init_size) Chunk(Chunk::init_size);
   _hwm = _chunk->bottom();      // Save the cached hwm, max
   _max = _chunk->top();
   set_size_in_bytes(Chunk::init_size);
 }
 Arena::Arena(Arena *a) : _chunk(a->_chunk), _hwm(a->_hwm), _max(a->_max), _first(a->_first) {
   set_size_in_bytes(a->size_in_bytes());
 }
 Arena *Arena::move_contents(Arena *copy) {
   copy->destruct_contents();
   copy->_chunk = _chunk;
   copy->_hwm   = _hwm;
   copy->_max   = _max;
   copy->_first = _first;
   copy->set_size_in_bytes(size_in_bytes());
   // Destroy original arena
   reset();
   return copy;            // Return Arena with contents
 }
 Arena::~Arena() {
   destruct_contents();
 }
 // Destroy this arenas contents and reset to empty
 void Arena::destruct_contents() {
   if (UseMallocOnly && _first != NULL) {
     char* end = _first->next() ? _first->top() : _hwm;
     free_malloced_objects(_first, _first->bottom(), end, _hwm);
   }
   _first->chop();
   reset();
 }
 // Total of all Chunks in arena
 size_t Arena::used() const {
   size_t sum = _chunk->length() - (_max-_hwm); // Size leftover in this Chunk
   register Chunk *k = _first;
   while( k != _chunk) {         // Whilst have Chunks in a row
     sum += k->length();         // Total size of this Chunk
     k = k->next();              // Bump along to next Chunk
   }
   return sum;                   // Return total consumed space.
 }
 // Grow a new Chunk
 void* Arena::grow( size_t x ) {
   // Get minimal required size.  Either real big, or even bigger for giant objs
   size_t len = MAX2(x, (size_t) Chunk::size);
   Chunk *k = _chunk;            // Get filled-up chunk address
   _chunk = new (len) Chunk(len);
   if (_chunk == NULL)
       vm_exit_out_of_memory(len * Chunk::aligned_overhead_size(), "Arena::grow");
   if (k) k->set_next(_chunk);   // Append new chunk to end of linked list
   else _first = _chunk;
   _hwm  = _chunk->bottom();     // Save the cached hwm, max
   _max =  _chunk->top();
   set_size_in_bytes(size_in_bytes() + len);
   void* result = _hwm;
   _hwm += x;
   return result;
 }
 // Reallocate storage in Arena.
 void *Arena::Arealloc(void* old_ptr, size_t old_size, size_t new_size) {
   assert(new_size >= 0, "bad size");
   if (new_size == 0) return NULL;
 #ifdef ASSERT
   if (UseMallocOnly) {
     // always allocate a new object  (otherwise we'll free this one twice)
     char* copy = (char*)Amalloc(new_size);
     size_t n = MIN2(old_size, new_size);
     if (n > 0) memcpy(copy, old_ptr, n);
     Afree(old_ptr,old_size);    // Mostly done to keep stats accurate
     return copy;
   }
 #endif
   char *c_old = (char*)old_ptr; // Handy name
   // Stupid fast special case
   if( new_size <= old_size ) {  // Shrink in-place
     if( c_old+old_size == _hwm) // Attempt to free the excess bytes
       _hwm = c_old+new_size;    // Adjust hwm
     return c_old;
   }
   // make sure that new_size is legal
   size_t corrected_new_size = ARENA_ALIGN(new_size);
   // See if we can resize in-place
   if( (c_old+old_size == _hwm) &&       // Adjusting recent thing
       (c_old+corrected_new_size <= _max) ) {      // Still fits where it sits
     _hwm = c_old+corrected_new_size;      // Adjust hwm
     return c_old;               // Return old pointer
   }
   // Oops, got to relocate guts
   void *new_ptr = Amalloc(new_size);
   memcpy( new_ptr, c_old, old_size );
   Afree(c_old,old_size);        // Mostly done to keep stats accurate
   return new_ptr;
 }
 // Determine if pointer belongs to this Arena or not.
 bool Arena::contains( const void *ptr ) const {
 #ifdef ASSERT
   if (UseMallocOnly) {
     // really slow, but not easy to make fast
     if (_chunk == NULL) return false;
     char** bottom = (char**)_chunk->bottom();
     for (char** p = (char**)_hwm - 1; p >= bottom; p--) {
       if (*p == ptr) return true;
     }
     for (Chunk *c = _first; c != NULL; c = c->next()) {
       if (c == _chunk) continue;  // current chunk has been processed
       char** bottom = (char**)c->bottom();
       for (char** p = (char**)c->top() - 1; p >= bottom; p--) {
         if (*p == ptr) return true;
       }
     }
     return false;
   }
 #endif
   if( (void*)_chunk->bottom() <= ptr && ptr < (void*)_hwm )
     return true;                // Check for in this chunk
   for (Chunk *c = _first; c; c = c->next()) {
     if (c == _chunk) continue;  // current chunk has been processed
     if ((void*)c->bottom() <= ptr && ptr < (void*)c->top()) {
       return true;              // Check for every chunk in Arena
     }
   }
   return false;                 // Not in any Chunk, so not in Arena
 }
 #ifdef ASSERT
 void* Arena::malloc(size_t size) {
   assert(UseMallocOnly, "shouldn't call");
   // use malloc, but save pointer in res. area for later freeing
   char** save = (char**)internal_malloc_4(sizeof(char*));
   return (*save = (char*)os::malloc(size));
 }
 // for debugging with UseMallocOnly
 void* Arena::internal_malloc_4(size_t x) {
   assert( (x&(sizeof(char*)-1)) == 0, "misaligned size" );
   if (_hwm + x > _max) {
     return grow(x);
   } else {
     char *old = _hwm;
     _hwm += x;
     return old;
   }
 }
 #endif
 //--------------------------------------------------------------------------------------
 // Non-product code
 #ifndef PRODUCT
 // The global operator new should never be called since it will usually indicate
 // a memory leak.  Use CHeapObj as the base class of such objects to make it explicit
 // that they're allocated on the C heap.
 // Commented out in product version to avoid conflicts with third-party C++ native code.
 // %% note this is causing a problem on solaris debug build. the global
 // new is being called from jdk source and causing data corruption.
 // src/share/native/sun/awt/font/fontmanager/textcache/hsMemory.cpp::hsSoftNew
 // define CATCH_OPERATOR_NEW_USAGE if you want to use this.
 #ifdef CATCH_OPERATOR_NEW_USAGE
 void* operator new(size_t size){
   static bool warned = false;
   if (!warned && warn_new_operator)
     warning("should not call global (default) operator new");
   warned = true;
   return (void *) AllocateHeap(size, "global operator new");
 }
 #endif
 void AllocatedObj::print() const       { print_on(tty); }
 void AllocatedObj::print_value() const { print_value_on(tty); }
 void AllocatedObj::print_on(outputStream* st) const {
   st->print_cr("AllocatedObj(" INTPTR_FORMAT ")", this);
 }
 void AllocatedObj::print_value_on(outputStream* st) const {
   st->print("AllocatedObj(" INTPTR_FORMAT ")", this);
 }
 size_t Arena::_bytes_allocated = 0;
 AllocStats::AllocStats() {
   start_mallocs = os::num_mallocs;
   start_frees = os::num_frees;
   start_malloc_bytes = os::alloc_bytes;
   start_res_bytes = Arena::_bytes_allocated;
 }
 int     AllocStats::num_mallocs() { return os::num_mallocs - start_mallocs; }
 size_t  AllocStats::alloc_bytes() { return os::alloc_bytes - start_malloc_bytes; }
 size_t  AllocStats::resource_bytes() { return Arena::_bytes_allocated - start_res_bytes; }
 int     AllocStats::num_frees() { return os::num_frees - start_frees; }
 void    AllocStats::print() {
   tty->print("%d mallocs (%ldK), %d frees, %ldK resrc",
              num_mallocs(), alloc_bytes()/K, num_frees(), resource_bytes()/K);
 }
 // debugging code
 inline void Arena::free_all(char** start, char** end) {
   for (char** p = start; p < end; p++) if (*p) os::free(*p);
 }
 void Arena::free_malloced_objects(Chunk* chunk, char* hwm, char* max, char* hwm2) {
   assert(UseMallocOnly, "should not call");
   // free all objects malloced since resource mark was created; resource area
   // contains their addresses
   if (chunk->next()) {
     // this chunk is full, and some others too
     for (Chunk* c = chunk->next(); c != NULL; c = c->next()) {
       char* top = c->top();
       if (c->next() == NULL) {
         top = hwm2;     // last junk is only used up to hwm2
         assert(c->contains(hwm2), "bad hwm2");
       }
       free_all((char**)c->bottom(), (char**)top);
     }
     assert(chunk->contains(hwm), "bad hwm");
     assert(chunk->contains(max), "bad max");
     free_all((char**)hwm, (char**)max);
   } else {
     // this chunk was partially used
     assert(chunk->contains(hwm), "bad hwm");
     assert(chunk->contains(hwm2), "bad hwm2");
     free_all((char**)hwm, (char**)hwm2);
   }
 }
 ReallocMark::ReallocMark() {
 #ifdef ASSERT
   Thread *thread = ThreadLocalStorage::get_thread_slow();
   _nesting = thread->resource_area()->nesting();
 #endif
 }
 void ReallocMark::check() {
 #ifdef ASSERT
   if (_nesting != Thread::current()->resource_area()->nesting()) {
     fatal("allocation bug: array could grow within nested ResourceMark");
   }
 #endif
 }
 #endif // Non-product

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/memory/allocation.cpp@c18cbe5936b8 (annotated)

src/share/vm/memory/allocation.cpp